Note! Depending on your country, OBDII vehicle may not pass the annual inspection unless the required monitors are 'ready'. Readiness monitors can have different completion status: The completion criteria is reset to 'Not ready' upon starting a new monitoring cycle. These self-check routines are reset only when the Check Engine Light and the Diagnostic Trouble Codes are cleared. The software supports both readiness monitor groups: The readiness monitors identify whether the vehicle's computer has completed the required tests while the vehicle is being driven. Vehicles perform up to 11 system tests, these are so called readiness monitors.

The purpose of readiness monitors to vehicle is to self-test their emission systems.